[PATCH 5.10 397/406] r8152: check budget for r8152_poll()

Greg Kroah-Hartman
2023-09-17T19:43:23Z

From: Hayes Wang <hayeswang@realtek.com>

[ Upstream commit a7b8d60b37237680009dd0b025fe8c067aba0ee3 ]

According to the document of napi, there is no rx process when the
budget is 0. Therefore, r8152_poll() has to return 0 directly when the
budget is equal to 0.

Fixes: d2187f8e4454 ("r8152: divide the tx and rx bottom functions")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/usb/r8152.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index f9a79d67d6d4f..cc7c86debfa27 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -2439,6 +2439,9 @@ static int r8152_poll(struct napi_struct *napi, int budget)
struct r8152 *tp = container_of(napi, struct r8152, napi);
int work_done;

+ if (!budget)
+ return 0;
+
work_done = rx_bottom(tp, budget);

if (work_done < budget) {
--
2.40.1